As an excellent wood varnish, several wooden works would be unsatisfactory without Polyurethane polishing. For best results, it’s practical to discover how long polyurethane takes to dry. Understanding the optimal curing time saves you more time and resources.
It requires around 2 to 4 hours for a water-based polyurethane and 6 to 10 hours for an oil-based to cure and eventually be subject to a second coating. Figures as these still vary depending on the type of base, humidity ratio, air pressure, and even the state of the woodwork.
Make sure to read our comprehensive guide to learn every important detail about polyurethane drying time and all other factors you’ll have to consider.
What Is Polyurethane Coating?
A polyurethane coating is a protective layer placed on the facet of a substrate. These coatings protect corrosion, weathering, abrasion, and other degrading procedures. Highly suitable for metal and concrete surfaces.
Another great feature of polyurethane floors are their flexibility with its gloss, subtle, translucent, or clear coatings. Since polyurethane coatings may seem comparable to other varnishes, certain qualities make them even more distinct and appropriate for particular purposes.
- Shows enough durability than other coatings, milder and even more flexible.
- More suitable for floorings, weather-resistant, and less susceptible to minor damages and scratches.
- It can preserve its form and mechanical qualities in temperatures as low as 30°F (-1°C).
- High in water content, forming a thick outer cover around woods after it hardens.
- The amount of waiting time produces a more solidified layer.
- Gives household items and valuable fixtures a wonderful polish, durability, and protection.
- Must be applied in single and particular coatings, taking a long time to finish one huge project.
- Longer waiting time for every coating application.
- Highly combustible. It can be harmful when they contact the skin or inhale, so excellent ventilation is also required when applying this finish.
Types Of Polyurethane
As a liquid polymer, the finish is created by dissolving the resin in a liquid solvent. There are oil-based and water-based solutions, so knowing which is best for your flooring is vital.
Oil-based polyurethane requires more time to dry and cure, but it is more durable and requires good ventilation. It functions well even with solvents, humidity, and high temperature. It’s perfect for regions with a lot of foot traffic. This finish appears clear at first, but it takes on yellowish or reddish colors as it ages.
An oil-based polymer can be used daily in one or two coatings relative to every product’s direction. Ensure to let it dry first for one day before using the surface and 2 days before putting on appliances.
Because water-based polyurethane varnish dries faster and is practically unscented, it requires minimal ventilation during application. It is simple to clean with water and will not discolor with time. But may become less durable in more foot-traffic spaces.
In 4-6 hours, water-based polyurethane may be recoated with 4 coats every day. After the last layer finishes, furniture must still be out on the flooring for 12 hours.
Distinctions: Oil-based Vs. Water-based
1. Because oil-based polyurethane contains higher solids than water-based varnish, only two applications are needed, while three are for water-based poly.
2. The water-based finish has a mild odor, while oil-based polyurethane is strong and overpowering.
3. Water-based polyurethane is up to three times more expensive than the oil-based one.
4. Since water-based poly is tougher, it is more vulnerable to surface abrasion. As a result, use a hardwood floor vacuum regularly to keep your floors clean. It’s also critical to use furniture pads to prevent denting.
Polyurethane Sheen Types
An additional factor to bear in mind for polyurethane drying time is its sheen type. Polyurethane varnishes are available in three sheen levels. After the finish has cured, it provides a degree of gloss. The various sheen kinds are listed here:
The satin polish is less gleaming than other finishes. With its flat appearance and faint gloss, it’s still the quickest drying poly on the market.
A Semi-gloss polyurethane is the midway point of sheen, but not as much as a high-gloss one. Most known in the market and cures slightly quicker than a high-gloss and takes a bit longer than satin.
High-gloss polyurethane does have a perfectly gleaming and glossy look. An extremely long-lasting and versatile sheen type. But it’s a little longer for this varnish to dry.
Influencing Factors In Polyurethane Drying
Several factors influence the time at which polyurethane dries. The following are some of these factors:
Polyurethane And Sheen Type
The choice of polyurethane base employed has a significant impact on the dry period. Oil-based coatings need a longer time to dry than water-based. Generally, oil-based polyurethane will be sticky for almost 10 hours, whereas water-based is dried in a short time and may eventually be good for the next layering.
This discrepancy between the types can significantly lengthen the time for completing a polyurethane work project from beginning to end. Both varieties of polyurethane take slightly longer to dry in gloss and semi-gloss varnishes.
High or very low temperatures might have an impact on the drying rate. Higher temperatures reduce the drying period since it settles the chemicals or liquid water in the poly faster.
As for lower temperatures, it reduces the drying rate since evaporation takes more time. Degrees below 65°F tend to affect dry time, while degrees below 55°F are cool, making the poly subsists very tacky.
Humidity And Moisture
Humidity affects dry time when combined with temp. Higher humidity also speeds up the drying process because of its moisture content. The air has a hard time taking more evaporated water, lengthening the dry period considerably up to 12 hours.
But low humidity below 40% might also speed up the drying process by sucking more moisture. In these scenarios, apply the polyurethane fast while preserving a moist border to create a cohesive coat.
The polyurethane will dry faster in a ventilated space because the breeze will continuously provide new air to collect more moisture. However, you may exercise extra caution when it comes to ventilation. Though fans can help with ventilation, they might stir up dust and debris, causing it to fall over the damp surface.
In employing polyurethanes, the rule is to apply thin layers. Thin coats dry more quickly and uniformly. The varnish will take longer to dry if the coat is overly strong.
The polyurethane varnish is applied by spraying, brushing, or wiping. Using a method that does not enable you to regulate the amount of product you apply properly, you may wind up putting excessively, delaying down the task.
Finishes will dry much faster if you use sprays or wipe-on poly rather than rollers and brushes. To prevent dealing with hazardous compounds, ensure to use suitable personal protective equipment.
Polyurethane Drying Vs. Curing
The term “drying time” refers to the time between polyurethane applications, whereas “curing time” relates to when the wooden surface is finally fit to walk on. It no longer feels tacky as polyurethane sets and is already fully dry. After that, you can apply additional coats up to a maximum as needed.
You can stand on the wood with shoes on once the last coat gets dried, but don’t put heavy furniture on it since it still requires more time to settle officially. Try not to spill any liquid on it, as this will soak into the sanded hardwood, causing you to start again. To put it another way, it is not yet sturdy, water-resistant, or usable.
How Long Does It Take For Polyurethane To Cure?
The curing time indicates it has entirely dried. Now, you’re able to finish a durable product that will easily handle your home furnishings, withstand pedestrian traffic, and resist scrapes for several years. The following is the cure time:
1. Water-based polyurethane can take anywhere from 3 to 21 days to cure. It’s touchable after 24 hours. You can put on some furniture after 2 days. And officially cured on the 20th day.
2. Polyurethanes based on oil last between 21 and 30 days. Finishes are touchable after 48 hours. You can put on some furniture after four or more days. And officially cured on the 30th day.
Tips In Speeding Up Polyurethane Drying Time
We may append our factors to make polyurethane dry quickly now that we’re aware of the causes affecting its drying and curing procedures. The methods below will help you speed up the process on your own.
1. If the temperature is too chilly for it to correctly dry, a source of heat is being used to fasten the process. You can innovate by using devices like a hairdryer or a portable heater. Use a little heat coating in mind – excessive amounts may ruin the finish.
2. Suppose the polyurethane is excessively stiff; thin it out to speed up the drying process. The use of paint rollers is quite effective. Glide over the application to create a uniform and successive coating, enabling a fully smooth covering.
3. In applying polyurethane outside, make sure to see the weather forecast from time to time. If there’s a chance of rain or high humidity, postpone the project.
4. Humidity is acutely susceptible to water-based polyurethane. Putting on the varnish in humid environments, ensure to use an oil solution. In extremely humid climates, this will dry sooner with a durable outcome.
5. Guarantee that the area to which you’re integrating the polyurethane is prepped and neat. The polyurethane attaches effectively and cures sooner if the hardwood surface is cleaned, polished, and smoothened.
As you notice, a couple of things are to be noted for us to know the accurate drying time of Polyurethane. Learn from this guide as you consider all other factors and relevant details influencing every drying process.